Side-by-Side Comparison
Food Additives & E-Numbers
E251: Sodium Nitrate (Chile Saltpeter / Slow Curing) vs. E501: Potassium Carbonate (Potash / Alkaline Noodle Salt)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
E251: Sodium Nitrate (Chile Saltpeter / Slow Curing)
E501: Potassium Carbonate (Potash / Alkaline Noodle Salt)
E251 (Sodium Nitrate / NaNO3) is an inorganic salt serving as a slow-release chemical reservoir of nitrite in long-aged cured meats and hard cheeses. INS 251, ADI is 3.7 mg/kg bw/day, enzymatically reduced into nitrite over months of curing.
E501 (Potassium Carbonates / K2CO3) is an inorganic alkaline mineral salt. INS 501(i), ADI is Not Limited (Quantum Satis), used as the key 'Kansui' alkaline agent in Japanese ramen noodles and in the Dutch processing of cocoa powder.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
E-Number Code
|
E251 | E501 |
|
INS / Codex Number
|
INS 251 | INS 501(i) (Potassium Carbonate) |
|
Functional Class
|
Preservative, Curing Agent, Antimicrobial | Acidity Regulator, Alkaline Leavening, Kansui Salt |
|
Acceptable Daily Intake (ADI)
|
3.7 mg / kg body weight per day (as nitrate ion) | Not Limited (Quantum Satis) |
|
Chemical Formula
|
NaNO3 | K2CO3 |
|
Primary Mechanism
|
Micrococcus and Staphylococcus bacterial nitrate reductase slowly converts nitrate (NO3-) into bioactive nitrite (NO2-) | Alkalinizes noodle dough (pH 9–11), tightening glutenin network and converting flavonoid pigments yellow |
|
Common Target Foods
|
Prosciutto di Parma, dry-cured salamis, Gouda cheeses (prevents late blowing by Clostridium tyrobutyricum) | Ramen noodles (Kansui), Dutch-process alkalized cocoa powder, gingerbread leavening |
|
Dietary Compliance
|
Mineral synthesis, Halal, Kosher, Vegan compliance | Vegan (Mineral salt), Halal, Kosher |
|
Safety Approval
|
EFSA Authorized / FDA 9 CFR 424.21 | EFSA Authorized / FDA GRAS (21 CFR 184.1619) |
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